Exercise mat



FIG. 1 is a top view of an exercise mat;

FIG. 2 is a bottom view of the exercise mat shown in FIG. 1;

FIG. 3 is a right side view, which is identical to the left side view, of the exercise mat shown in FIG. 1; and,

FIG. 4 is a front view, which is identical to the rear view, of the exercise mat shown in FIG. 1. 

CLAIM The ornamental design for an exercise mat, as shown and described. 